Beatrice Lang
Voltage and amperage are both measures of electrical current, but amperage is the more important factor when it comes to the dangers of electrical shock. The human body's low resistance means that a small amount of current can be fatal, with 10mA or 0.01A considered a severe shock, and 100mA or 0.1A enough to induce muscle contractions. The path of the current is also a factor, with electricity passing from hand to hand through the heart potentially causing ventricular fibrillation, which can be fatal.
| Characteristics | Values |
|---|---|
| Current that can be fatal | 1/10th of an ampere for 2 seconds |
| Current that causes severe shock but is not fatal | 10 mA or 0.01 A |
| Current that causes muscle contractions | 100 mA or 0.1 A |
| Current that causes respiratory paralysis | 30 mA |
| Current that causes ventricular fibrillation | 75 mA |
| Current that causes heart paralysis | 4 A |
| Current that causes tissue burning | 5 A |
| Current that causes severe burns | 600 V |
| Current that causes damage to internal organs | 600 V |
| Current that is fatal | Depends on the length of exposure and the path of the current |
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What You'll Learn
The path of the current through the body
The path of the electric current through the body is a crucial factor in determining the severity of an electric shock. The human body is a conductor of electricity, and when it comes into contact with an electrical source, a circuit is formed, allowing the current to flow through. The current typically enters the body at one point of contact and exits at another, with the path between these two points being the most critical.
The severity of the shock depends on the amount of current and the duration of exposure. For example, if the current flows from the right hand to the right leg, it may cause pain but might not be lethal. On the other hand, if the current travels from one hand to the other, passing through the heart, it can induce ventricular fibrillation, a potentially fatal condition.
The human body has varying levels of resistance in different parts, which influences the path of the electric current. The skin acts as an initial barrier and has higher resistance than the inside of the body. This means that a small current may be absorbed by the skin and not reach vital organs. However, if the current overcomes the skin's resistance or enters the body through a lower-resistance path, it can cause severe damage.
Additionally, the muscle structure of the person also plays a role in determining the effects of electric shock. People with less muscle tissue are typically affected by lower current levels. Furthermore, electric currents tend to flow through paths in the body with minimum resistance, which can include nerves, muscles, and bones. The current can cause involuntary muscle contractions, which may result in the victim being "thrown" backward or unable to let go of the electrical source.
The path of the current also depends on external factors such as moisture. Wet skin has lower resistance, allowing more current to pass through and increasing the severity of the shock. Similarly, the size of the contact area and the inability to let go of the electrical source impact the path and intensity of the current. All these factors contribute to the overall effect of electric shock on the human body.
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Alternating Current (AC) vs Direct Current (DC)
The human body's resistance to electric current varies depending on the path the current takes. The skin has higher resistance than the inside of the body, so a current that flows from the right hand to the right leg may cause pain but might not be lethal. However, if the current travels from the right hand to the left hand, passing through the heart, it can induce ventricular fibrillation, which can be fatal.
Both Alternating Current (AC) and Direct Current (DC) can be fatal. However, the extent of the damage depends on the duration of exposure. For example, a current of one-tenth of an ampere can be fatal if the exposure is 2 seconds or longer.
Alternating Current (AC) and Direct Current (DC) are two methods of electric current flow in a circuit. DC is a unidirectional flow, meaning the electric charge moves in a constant direction from the negative to the positive terminal. It is obtained from batteries, solar cells, and other similar sources. On the other hand, AC is characterized by its periodically changing direction of flow. The voltage in AC circuits also alternates because of the changing current direction. AC is obtained from generators or power outlets.
The rivalry between AC and DC goes back to the late 19th century, with Thomas Edison championing DC and George Westinghouse advocating for AC. Edison had constructed 121 DC power stations in the United States by 1887. However, transmitting power to rural communities with DC was inefficient, so AC ultimately became the dominant power source.
One advantage of AC is its ability to transform voltage levels easily, making it more feasible for high-voltage transmission over long distances. AC is also used to power electric motors in large appliances like dishwashers and refrigerators. In contrast, DC is found in almost all electronics and is easier to understand, as it provides a constant voltage or current. However, interrupting DC circuits, especially at high voltages, can be challenging due to the continuous voltage, which can lead to electrical arcs and safety risks.
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Voltage and amperage differences
While both amperage and voltage are measures of electrical current or the flow of electrons, they do not mean the same thing. Voltage is the measure of the pressure that allows electrons to flow, while amperage is the measure of the volume of electrons. For instance, a higher voltage power supply does not necessarily mean a higher volume of electricity travelling through the system.
The danger of electric shock lies in the amperage or the volume of electricity. Tiny changes in amperage can mean the difference between life and death. For example, a current of 10 mA or 0.01 A is a severe shock, but it is not fatal. As the amperage increases to 0.1 A, muscle contractions set in. Due to the low resistance of the heart, a current of only 10 mA is sufficient to induce ventricular fibrillation, which can be fatal.
However, voltage cannot be completely discarded, as without it or a potential difference, there would be no current at all. For instance, hanging from a high-voltage wire will not electrocute you unless you touch the ground. Touching the ground immediately creates a potential difference, which draws a huge current through the victim.
The length of time of exposure to an electric current also affects the danger. For example, a current of 100 mA applied for 3 seconds is as dangerous as a current of 900 mA applied for a fraction of a second (0.03 seconds). The path of the current through the body also matters. If the current flows from the right hand to the right leg, it may cause pain but might not be lethal. However, if the current travels from the right hand to the left hand, passing through the heart, it has the potential to induce ventricular fibrillation, which can be fatal.
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Electrical shock effects
A current of 10 milliamps (mA) or 0.01 amps (A) can deliver a severe shock but is typically non-fatal. As the amperage increases, the effects on the body become more severe. At 50–150 mA, the individual may experience extreme pain, severe muscle reactions, respiratory arrest, and possibly death.
At 100 mA, the current can induce muscle contractions and, if it passes through the heart, ventricular fibrillation, which is often fatal. The path of the current through the body is crucial. If it travels from the right hand to the right leg, it may cause pain but might not be lethal. However, if it passes from the right hand to the left hand, going through the heart, it can be fatal.
The muscle structure of the person also matters. People with less muscle tissue are typically affected by lower current levels. Even low voltages can be dangerous, especially if the body is in contact with the circuit for a more extended period. High voltages can cause violent muscle contractions, leading to loss of balance and falls, which may result in further injuries or death.
Additionally, electrical shocks can cause severe burns, internal bleeding, and destruction of tissues, nerves, and muscles. The severity of the burn depends on the amperage, with currents greater than 5 A causing tissue burns.
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Time of exposure
The amount of time a person is exposed to an electric current is a critical factor in determining whether the shock will be fatal. Even a low voltage can be extremely dangerous if the body is in contact with the circuit for a long time.
The human skin acts as the first line of defence against electrical currents, and its resistance is higher than that of the inside of the body. Therefore, a current of one-tenth of an ampere flowing from the right hand to the right leg may cause pain but might not be lethal. However, if the current travels from the right hand to the left hand, passing through the heart, it can induce ventricular fibrillation, which can be fatal.
The path of the electric current through the body is crucial. A current passing from the hands to the feet can be fatal as it involves both the heart and lungs. A current of 100 mA applied for 3 seconds is as dangerous as a current of 900 mA applied for a fraction of a second (0.03 seconds).
The human body's muscle structure also plays a role in its susceptibility to electric shock. People with less muscle tissue are typically affected by lower current levels. For example, a current of 30 mA can cause respiratory paralysis, while currents greater than 75 mA can cause ventricular fibrillation, leading to death within a few minutes unless a defibrillator is used. Heart paralysis occurs at 4 amps, and tissue burns occur at currents greater than 5 amps.
In summary, the time of exposure to an electric current is a critical factor in determining its lethality. Even low voltages can be fatal if the exposure time is prolonged, and the path of the current and the individual's muscle structure also play significant roles in the outcome.
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Frequently asked questions
A current of 10mA or 0.01A is a severe shock but is not fatal. Currents greater than 75mA are considered fatal as they cause ventricular fibrillation, a condition that will cause death within a few minutes unless a defibrillator is used.
If the current travels from the right hand to the right leg, it may cause pain but might not be lethal. However, if the current travels from hand to hand, it passes through the heart and can induce ventricular fibrillation, which is often fatal.
The length of time of the shock greatly affects the amount of injury. A longer shock of a few seconds could be fatal if the level of current is high enough to cause the heart to go into ventricular fibrillation.
